To ease range anxiety, component giants compete for heat-management systems


Not only range anxiety, battery safety anxiety and life anxiety of new energy vehicles are related to the thermal management system. As one of the core technologies of new energy vehicles in addition to "three electricity", thermal management system has become another "arena" for domestic and foreign automobile enterprises to compete.

Not only is the tesla, BMW, saic, byd, such as wei to automobile enterprise at home and abroad on electric vehicles intensify the attention of the whole vehicle thermal management level, and valeo, mahler, continental, berg warner, lane components for the international giants, such as metals and hualand domestic parts enterprises such as cars, three flowers intelligence control is to accelerate the market role in new energy vehicle thermal management system.

Beach thermal management System market

At the Shanghai Auto Show, Valeo demonstrated its multi-scenario, multi-climate thermal management system and cabin comfort solutions, including an innovative heat pump system that uses refrigerants to convert air energy into power, effectively heating, cooling and defogging the cabin.

The heat pump in the Mahler thermal management system concentrates the heat generated by components such as batteries, traction motors and power electronics and allows them to be upgraded to heat the car. "We have already secured a batch production project for the heat pump, and the first batch production project will be in China." Mahler Group Management Board Chairman and chief executive officer to the media. Mahler is also working with Faurecia to develop innovative cabin thermal management technology.

In BorgWarner's full range of thermal management solutions, including cockpit and battery heaters, efficient battery heaters have fast response characteristics for optimal battery and cabin temperature management. High-pressure cabin heaters provide a comfortable interior with zonal heating and core temperature sensing capabilities.

Webast also integrates the thermal management system into the lower housing, making the system more integrated and the thermal management more efficient.

The thermal management system demonstrated by Continental uses new technologies such as a new multi-way valve-coolant flow control valve to meet the heating and cooling needs of the vehicle in a more energy-efficient manner. The first thermal management systems for electric vehicles are scheduled to begin mass production in China by the end of 2019.

Heat pump air conditioning ensures low energy consumption heating

At present, most electric vehicles mainly rely on electric heaters to increase the temperature, resulting in a shorter range and charging cycle. How to deal with the changeable and even extreme climate conditions, while improving the comfort of riding, to ensure the optimal driving range, is a problem that must be solved in the development of electric vehicles.

In the electric vehicle, battery and electric drive system replace the engine, and the electric vehicle air conditioning system has a great change compared with the traditional automobile air conditioning system. The first is the refrigeration mode, the refrigerant circulation power source is provided by the electric compressor; The second is the heating mode, which needs to find alternative heat sources for engine coolant, such as PTC and water heating cycle. From the trend point of view, to ensure low energy consumption heating, heat pump air conditioning is the best solution, its efficiency coefficient is 2-3 times higher than PTC heating, the driving range can be increased by more than 20%, Nissan Leaf, Toyota Prius, BMW i3, Volkswagen electric golf and other models have been mass produced and installed. The domestic heat pump penetration rate is expected to reach 10% by 2020 and 30% by 2025.

Heat pump air conditioning system in refrigeration and heating mode sharing a set of refrigerant circulation system, through the solenoid valve, electronic expansion valve and electric compressor switching and control, to achieve refrigeration, heating, dehumidification and other functions.

At present, Denso, Valeo, Hanang, Mahle and other international thermal management giants have launched on-board heat pump air conditioning systems, and some domestic component companies have also begun to form a supply system. Among them, it is worth mentioning that HUanyu Three Power owned by Huanyu Automobile owns the independent intellectual property rights of heat pump air-conditioning system design and core parts. Turning on the warm air conditioner in winter can increase the vehicle's range by about 30% compared with the air conditioning system that uses the high-pressure PTC to provide heat source. The Roewe Ei5 and MARVEL X, equipped with the heat pump air-conditioning system, have excellent winter driving range even when the air is warm.

The main cause of spontaneous combustion is battery heat out of control

The thermal management system of new energy vehicles is mainly composed of four parts: automobile air conditioning system, battery thermal management system, electric control cooling system of motor and cooling system of reducer.

With the increase of electric vehicle on-board power and the improvement of battery energy density, the technology level of battery thermal management system not only directly affects the performance of driving range, but also relates to the safety of electric vehicles. The management object of the thermal management system of new energy vehicles also extends from the cockpit to the battery, electrical control and other fields.

According to public opinion information from the State Administration for Market Regulation, more than 40 new energy vehicles caught fire in 2018. The main reason of electric vehicle spontaneous combustion, to a large extent because electric vehicle battery heat out of control to heat spread, resulting in accidents. Generally speaking, thermal runaway is the failure of the thermal management system that protects the stability of the battery due to design defects and other reasons, resulting in overheating of the battery, and then spontaneous combustion.

The battery thermal management system keeps the battery in normal working condition within 45℃ through technical means. Even if the temperature of some batteries in the battery pack is too high, the thermal management system can detect and alarm in time, and make appropriate intervention.